service MITSUBISHI LANCER EVOLUTION 2007 Service Repair Manual

ABS <4WD> -Troubleshooting35B-9
INSPECTION PROCEDURE FOR DIAGNOSIS CODES
Code Nos.11, 12, 13 and 14 Wheel speed sensor
(open circuit or short circuit)Probable cause
Code Nos.21, 22, 23 and 24 Wheel speed sensor
Code Nos. 11, 12, 13 and 14 are output if the ABS-ECU detects an open circuit
or short-circuit in the (+) wire or ( - ) wire in any one of the four wheel speed sensors.DMalfunction of wheel speed sensor
DMalfunction of wiring harness or connector
DMalfunction of hydraulic unit and ABS-ECU
Code Nos. 21, 22, 23 and 24 are output in the following cases.
DWhen there is no input from any one of the four wheel speed sensors when travelling
at several km/h or more, even though open circuit can not be verified.
DWhen a chipped or blocked-up ABS rotor is detected and if the anti-lock system
operates continuously because a malfunctioning sensor or a warped ABS rotor
is causing sensor output to drop.DMalfunction of wheel speed sensor
DMalfunction of wiring harness or connector
DMalfunction of ABS rotor
DToo much gap between the sensor and the ABS rotor
DMalfunction of hydraulic unit and ABS-ECU
DMalfunction of wheel bearing
NG
NG
Replace
OK
Check the harness wire, and repair if necessary.
DBetween each wheel speed sensor and ABS-ECU
NG
Repair
OK
Wheel bearing check
(Refer to GROUP 26 and
GROUP 27 - On-vehicle
Service.)
NG
Repair
NG
Replace the hydraulic unit and ABS-ECU.
OK
Check the trouble
symptom.
Check the following connector:B-123
OK
ABS rotor check
(Refer to P.35B-34.)NG
Replace
NG
Wheel speed sensor
check
(Refer to P.35B-34.)NG
Replace
OK
Wheel speed sensor output voltage check (Refer to P.35B-26.)OK
Check the trouble
symptom.
OK
Check the following connectors:
A-03, A-37, A-43 <L.H. drive vehicles>, C-111, C-128, C-136 <R.H.
drive vehicles>, C-146, D-04, D-10, D-30
OK
Measure at the ABS-ECU connector B-123.
DDisconnect the connector, and measure at the harness side
connector.
DResistances between 6 and 7, 8 and 9, 22 and 31, 29 and
30
OK:1.24 - 1.64 kΩNGWheel speed sensor check (Refer to P.35B-34.)
Wheel speed sensor installation checkNG
Repair

ABS <4WD> -Troubleshooting35B-15
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptomsInspection procedure
No.Reference page
Communication between the MUT-IIand the whole system is not
possible.135B-16
Communication between the MUT-IIand the ABS-ECU is not possible.235B-17
When the ignition key is turned to “ON” (engine stopped), the ABS
warning lamp does not illuminate.335B-18
Even after the engine is started, the ABS warning lamp remains
illuminated.435B-18
In the inspection with MUT-II service data, the parking brake switch is not
turned ON or turn OFF.535B-19
The neutral position learning of the steering wheel sensor is not finished.635B-20
Faulty ABS operation735B-21
Caution
1. If steering movements are made when driving at high speed, or when driving on road surfaces
with low frictional resistance, or when passing over bumps, the ABS may operate even though
sudden braking is not being applied. Because of this, when getting information from the customer,
check if the problem occurred while driving under such conditions as these.
2. During ABS operation, the brake pedal may vibrate or may not be able to be depressed. Such
phenomena are due to intermittent changes in hydraulic pressure inside the brake line to prevent
the wheels from locking and is not an abnormality.

ABS <4WD> -Troubleshooting35B-19
Inspection Procedure 5
In the inspection by MUT-II service data, the parking brake
switch is not turned ON or turn OFF.
Probable cause
ABS-ECU optimizes the ABS control when pulling the parking brake lever, parking
brake switch signal is used as support. If there is a fault in the parking brake switch
system, ABS control is not optimized.DMalfunction of parking brake switch
DMalfunction of wiring harness or connector
DMalfunction of hydraulic unit and ABS-ECU
OK
NG
NG
Check the harness wire.
DBetween parking brake switch and ABS-ECU
Replace the hydraulic unit and ABS-ECU.
OK
NG
OK
Check the trouble symptom.
Repair
NG
RepairCheck the following connectors:B-123, C-26, C-128 <R.H. drive
vehicles>, C-130 <L.H. drive vehicles>, D-23
Measure at the ABS-ECU connector B-123.
DDisconnect the connector, and measure at the harness side
connector.
DMeasure by pulling or releasing the parking brake lever.
DContinuity between 1 and body earth
OK:Continuity <Pulling the lever>
OK:No continuity <Releasing the lever>
NG
Repair
NG
OK
Check the trouble
symptom.
Check the following connector:B-123
OK
Replace the parking brake switch. (Refer to GROUP 36.)
NG
RepairCheck the parking brake switch installation condition.

ABS <4WD> -Troubleshooting35B-20
Inspection Procedure 6
The neutral position learning of the steering wheel sensor
is not finished.
Probable cause
The diagnosis is difficult because it depends on driving condition and road surface,
if the diagnosis code displays the normal code, carry out the following check.DEquipment the odd diameter tyre
DMalfunction of suspension
DMalfunction of steering wheel sensor installation
DMalfunction of stop lamp switch system
DMalfunction of hydraulic unit and ABS-ECU
NG
NG
NG
NG
Check the harness wire, and repair if necessary.
DBetween battery and stop lamp switch
DBetween stop lamp switch and ABS-ECU
OK
Check the trouble
symptom.
OK
Check the following connectors:B-123, C-103, C-108, C-130,
C-135
OK
Check the stop lamp switch. (Refer to GROUP 35A - Brake Pedal.)
Check the stop lamp switch installation condition.
(Refer to GROUP 35A - On-vehicle Service.) NO
Repair
OKNG
RepairOKNG
RepairReplace
NG
Replace the hydraulic unit
and ABS-ECU.
NG
Check the harness wire,
and repair if necessary.
DBetween stop lamp
switch and ABS-ECURepair
Check the trouble
symptom.
NG
Check the following
connectors:
C-108, C-130
Check the trouble
symptom.
OK
Check the following
connector:B-123
YES
Measure at the ABS-ECU connector B-123.
DDisconnect the connector, and measure at the harness side
connector.
DStop lamp switch: ON
DVoltage between 19 and body earth
OK:System voltage
Does the stop lamp turn on and off normally?
YES
Repair
NO
Is the odd diameter tire equipped?
YES
Repair
NO
Is the suspension abnormal?
NO
YES
When the steering wheel position is neutral, does the steering wheel
sensor (ST-N) turn ON in the MUT-II service data?Check the steering wheel sensor and the steering wheel installation
condition.

ABS <4WD> -Troubleshooting35B-21
Inspection Procedure 7
Faulty ABS operation
Probable cause
This varies depending on the driving conditions and the road surface conditions, so
problem diagnosis is difficult. However, if a normal diagnosis code is displayed, carry
out the following inspection.DImproper installation of wheel speed sensor
DMalfunction of wiring harness or connector
DMalfunction of wheel speed sensor
DMalfunction of ABS rotor
DForeign material adhering to wheel speed sensor
DMalfunction of wheel bearing
DMalfunction of hydraulic unit and ABS-ECU
OK
OK
Check the following connector:B-123
NG
Measure at the ABS-ECU connector B-123.
DDisconnect the connector, and measure at the harness side
connector.
DResistances between 6 and 7, 8 and 9, 22 and 31, 29 and
30
OK:1.24 - 1.64 kΩ
(The sensor harness and connector should be moved while
these inspections are carried out.)NG
OK
Check the trouble symptom.
OK
NG
Repair
OK
Wheel bearing check (Refer to GROUP 26 and GROUP 27 -
On-vehicle Service.)NG
Repair
OK
ABS rotor check (Refer to P.35B-34.)NG
Repair
NG
Wheel speed sensor check (Refer to P.35B-34.)NGReplace the wheel speed sensor.
OK
Wheel speed sensor output voltage check (Refer to P.35B-26.)OKHydraulic unit check (Refer to P.35B-28.)
Wheel speed sensor installation checkNG
Repair
Check the harness wire.
DBetween each wheel speed sensor and ABS-ECU
NG
Repair
NG
NG
RepairOK
Check the following connectors:B-123, C-128 <R.H. drive
vehicles>, C-43
NG
Check the trouble symptom.
RepairNG
OK
Check the harness wire.
DBetween 4WD-ECU and ABS-ECU OK
Measure at the 4WD-ECU connector C-43. <ABS signal check>
DDisconnect the connector, and measure at the harness side
connector.
DCarry out the ABS signal of the actuator test from the ABS
menu of the MUT-II.
DVoltage between 49 and body earth
OK:Less than 1.0V for initial 10 seconds, then system voltage
NGABS signal check
DDisplay the ABS signal of the service data from ACD (4WD)
menu of MUT-II.
OK:Displays OFF
DBrake in safety area, operate the ABS (possible to inspect
in first velocity of approx. 30km/h)
OK:Displays ON (in operating ABS)
NG
Check the trouble symptom.
Replace the hydraulic unit and ABS-ECU.
Check the following connectors:
A-03, A-37, A-43 <L.H. drive vehicles>, C-111, C-128, C-136 <R.H.
drive vehicles>, C-146, D-04, D-10, D-30

ABS <4WD> -Troubleshooting35B-22
DATA LIST REFERENCE TABLE
The following items can be read by the MUT-IIfrom the ABS-ECU input data.
1. When the system is normal
Item No.Check itemChecking requirementsNormal value
11Front-right wheel speed sensorPerform a test runVehicle speeds
displayedonthe
12Front-left wheel speed sensor
displayedonthe
speedometer and
MUTIIareidentical13Rear-right wheel speed sensorMUT-IIareidentical.
14Rear-left wheel speed sensor
21Power supply voltageIgnition switch: ON10 - 16 V
29Parking brake switchPull the parking brake lever.ON
Release the parking brake lever.OFF
36Stop lamp switchDepress the brake pedal.ON
Release the brake pedal.OFF
37Steering wheel sensor neutral
position learningAfter driving straightly with vehicle speed more
than 10km/hON
Before driving with ignition switch ONOFF
71Lateral G sensorWhen vehicle stops2.4 - 2.6 V
When vehicle drives1.0 - 4.0 V
74Steering wheel sensor (ST-N)Ignition switch: ONSteering:
Neutral position and
position near by±
360_ON
Steering:
Except for aboveOFF
75Steering wheel sensor (ST-1)Ignition switch: ONSteering:
Turnlaterallyslowly
Display ON and OFF
alternately
76Steering wheel sensor (ST-2)
Turnlaterallyslowlyalternately
86Steering degreeIgnition switch: ON
Steering wheel sensor
tlitili
Steering: Steer by
90_to the right+90_
g
neutral position learning
is finished (service data
N37di lON)
Steering: NeutralOFF(
No. 37 displays ON)Steering: Steer by
90_to the left-90_
2. When the ABS-ECU shut off ABS operation
When the diagnosis system stops the ABS-ECU, the MUT-IIdisplay data will be unreliable.

ABS <4WD> -Troubleshooting/On-vehicle Service35B-26
RESISTANCE AND CONTINUITY BETWEEN
HARNESS-SIDE CONNECTOR TERMINALS
1. Turn the ignition key to the “LOCK” (OFF) position.
2. Disconnect the ABS-ECU connector.
3. Check the resistance and continuity between the terminals
indicated in the table below.
4. The terminal layout is shown in the illustration.
ABS-ECU terminal No.SignalNormal condition
6-7Wheel speed sensor (rear left)1.24 - 1.64 kΩ
8-9Wheel speed sensor (rear right)
22 - 31Wheel speed sensor (front left)
29 - 30Wheel speed sensor (front right)
12 - Body earthEarthContinuity
34 - Body earthEarth
ON-VEHICLE SERVICE
WHEEL SPEED SENSOR OUTPUT VOLTAGE
CHECK
1. Lift up the vehicle and release the parking brake.
2. Move the lock lever of the ABS-ECU connector as shown
in the illustration, and then disconnect the ABS-ECU
connector.
3. Push up and unlock the hooks of the ABS-ECU connector
shown in the illustration, then remove the connector cover.
Lock lever

ABS <4WD> -On-vehicle Service35B-27
4. Rotate the wheel to be measured at approximately 1/2 - 1
rotation per second, and check the output voltage using a
circuit tester or an oscilloscope.
Wheel speed
sensorFront
leftFront
rightRear
leftRear
right
Terminal No.222968
313079
Output voltage
When measuring with a circuit tester:
42 mV or more
When measuring with an oscilloscope:
120 mV p-p or more
5. The followings are suspected if the output voltage is lower
than the value described above. Check the wheel speed
sensor, and replace if necessary.
DToo large clearance between the pole piece of the
wheel speed sensor and ABS rotor
DFaulty wheel speed sensor
Inspecting Waveforms With An Oscilloscope
Use the following method to observe the output voltage
waveform from each wheel speed sensor with an oscilloscope.
DStart the engine, and rotate the front wheels by engaging
1st gear. Turn the rear wheels manually so that they
rotate at a constant speed.
NOTE
1. The waveform measurements can also be taken while
the vehicle is actually moving.
2. The output voltage will be small when the wheel speed
is low, and similarly it will be large when the wheel speed
is high.
Points In Waveform Measurement
SymptomProbable causesRemedy
Too small or zero waveform
amplitudeFaulty wheel speed sensorReplace sensor
Waveform amplitude fluctuates
excessivel
y(this is noproblem if
Axle hub eccentric or with large runoutReplace hub
excessively(thisisnoproblemif
the minimum amplitude is 100 mV
or more)Faulty ABS-ECU earthRepair
When turning by hand
When idling (5 - 6 km/h), 1st gear
10.0 ms/DIV 1 V/DIV

ABS <4WD> -On-vehicle Service35B-28
SymptomRemedy Probable causes
Noisy or disturbed waveformOpen circuit in sensorReplace sensor
Open circuit in harnessCorrect harness
Incorrectly mounted wheel speed sensorMount correctly
ABS rotor with missing or damaged teethReplace ABS rotor
Caution
Because the wheel speed sensor cables move together with the front and rear suspension, they
vibrate greatly when driving over poor road surfaces. As a result, the sensor harnesses should also
be shaken when monitoring of output waveforms of the wheel speed sensors in order to simulate
conditions such as driving over poor road surfaces.
HYDRAULIC UNIT CHECK
1. Jack up the vehicle and support the vehicle with rigid racks placed at the specified jack-up points
or place the wheels which are checked on the rollers of the braking force tester.
Caution
(1) The roller of the braking force tester and the tyre should be dry during testing.
(2) When testing the front brakes, apply the parking brake, and when testing the rear brakes,
stop the front wheels by chocking them.
2. Turn the ignition key to the “LOCK” (OFF) position and set the MUT-II.
Caution
Turn the ignition key to the “LOCK” (OFF) position before connecting or disconnecting the
MUT-II.
3. After checking that the shift lever is in neutral, start the engine.
4. Use the MUT-IIto force-drive the actuator.
NOTE
(1) During the actuator test, the ABS warning lamp will illuminate and the anti-skid control will be
cancelled.
(2) When the ABS has been interrupted by the fail-safe function, the MUT-IIactuator testing cannot
be carried out.
5. Turn the wheel by hand and check the change in braking force when the brake pedal is depressed.
When using the braking force tester, depress the brake pedal until the braking force is at the following
values, and check that the braking force decreases when the actuator is force-driven.
Front wheel785 - 981 N
Rear wheel588 - 784 N

ABS <4WD> -On-vehicle Service35B-29
The result should be as shown in the following diagram.
Approx. 0.05 seconds
Pedal operationDepressed
Released
Solenoid valve
positionIncrease in pressure
Steady pressure
Reduction in pressure
Checking the
brake forceLock
Drag force when the pedal is freeMUT-IIactuator test
(Item No. 01, 02, 03, 04) start
2 seconds
1 seconds
6. If the result of inspection is abnormal, correct according to the following “Diagnosis Table.”
Diagnosis Table
No.MUT-II
display
OperationJudgementProbable
cause
Remedy
display
NormalAbnormal
cause
01FR VALVE(1) Depress the brake
pedal to lock wheel.
(2) Using the MUT-II,
select the wheel to be
checkedandforcethe
Brake force
released for 3
seconds after
locking.Wheel does
not lock when
brake pedal
is depressed.Clogged
brake line
other than
hydraulic unitCheck and
clean brake
line.
02FL VALVEchecked and force the
actuator to operate.
(3) Check the brake force
for the selected wheel
using a brake force
ttbttith
Clogged
hydraulic
circuit in
hydraulic unitReplace
hydraulic unit
assembly.
03RR VALVE
g
tester or by rotating the
wheel by hand.Brake force is
not released.Incorrect
hydraulic unit
brake tube
connectionConnect
correctly.
04RL VALVEHydraulic unit
solenoid
valve not
functioning
correctlyReplace
hydraulic unit
assembly.
7. After checking, turn the ignition switch to the “LOCK” (OFF) position and then disconnect the MUT-II.
REMEDY FOR A FLAT BATTERY
When booster cables are used to start the engine when the
battery is completely flat and then the vehicle is immediately
driven without waiting for the battery to recharge itself to
some extent, the engine may misfire, and driving might not
be possible. This happens because ABS consumes a great
amount of current for its self-check function. If this happens,
recharge the battery fully.
Caution
The vehicle posture will be unstable during braking, so
do not drive the vehicle with the ABS-ECU connector
disconnected or with the ABS not operating for any other
reason.